const mongoose = require('mongoose')
const DB_URL = 'mongodb://localhost:27017/test2';

/** * 连接 */
mongoose.connect(DB_URL,{useNewUrlParser:true}); 
/** * 连接成功 */
mongoose.connection.on('connected', function () {

    console.log('Mongoose connection open to ' + DB_URL);
}); 
/** * 连接异常 */
mongoose.connection.on('error', function (err) {

    console.log('Mongoose connection error: ' + err);
});
/** * 连接断开 */
mongoose.connection.on('disconnected', function () {

    console.log('Mongoose connection disconnected');
});

module.exports = mongoose;

